I surely do know the cause of the issue. It’s happening because I’m using my own icon fonts (which is a combination of a large collection of fonts generated at fontello.com). I believe my set-up of the icons is messing up with the plugin’s integration of FontAwesome.

So what do you think should be the best fix for the same?

(PS – I hope you don’t need the live site view. But let me know if you need ANY information and ANY data from the site)

Well apparently, I decided to stick with FontAwesome (as I’ve been doing since months with my other sites). Just wanted to give a try to some other icon packages, but it turns out that 80% of the icons I usually use are the same (a few lines here and there maybe).